A vacuum bag includes a tubular, flat main body and one or more embossed interposition sheets. The main body has upper and lower portions. The embossed interposition sheets are bonded at both side ends of the main body while being interposed between the upper and lower portions. The one side end of each...http://www.google.com.tw/patents/US6883665?utm_source=gb-gplus-share專利 US6883665 - Vacuum packing bag
